feat(cfold): canonicalize custom test layout

tests/ghost/recipe_meta.py

@@ -2,7 +2,7 @@
 # Ghost serves an HTML site at `/`; admin UI at `/ghost/`. The first GET to /ghost/ redirects
 # to the setup wizard (302). Ghost exposes a JSON Content API at /ghost/api/content/ which
 # requires an API key; the Admin API at /ghost/api/admin/ requires a session/token (see
-# functional/_ghost.py — version-negotiated, no /v3/ path).
+# custom/_ghost.py — version-negotiated, no /v3/ path).
 # State lives in a **MySQL** `ghost` DB (compose `db` service, mysql:8.0) + the `ghost_content`
 # volume (themes/images) — NOT sqlite. The `db` service is backupbot-labelled with a logical
 # mysqldump pre-hook; P4 (ops.py + test_{backup,restore,upgrade}.py) seeds a `ci_marker` row there.